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Jon Katz, the author of “Geeks” and the forthcoming “Voices from the Hell Mouth,” compares agitation over e-mail to the Salem Witch Trials. “Despite the impression of Columbine,” he said, “violence among young people has been dropping over the past decade. It's now at its lowest point since the 1920s.” Katz added, “People have the right to express violent fantasies. They have the right to be depressed. They don't have to be civil or positive or constructive in their private e-mail.”